What's the biggest mistake investors make? Analyzing a company's prospects without paying any attention to the bigger picture. With that in mind, here's how to assess the big picture so you can make the right call.

The Pythagorean Theorem isn't going to make you any money. Nor the quadratic equation. But there is a financial formula -- an immutable law of investing -- that can help you choose stocks that will pay a double-digit yield for as long as you own them.

Best execution refers to the imperative that a broker, market maker, or other agent acting on behalf of an investor is obligated to execute the investor's order in a way that is most advantageous to the investor rather than the agent.

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